Steel retainer



June 21, 1927 a, c. HANsm STEEL RETAINER Filsd. Aug, '7, 1925 1 13 115 AW EWEY.

Patented June 21, 1927.

CHARLES c. HANSEN, or EASTON, PENNSYLVANIA, AssiGNon TO INeEn soLL-nANnCOMPANY, OF JERSEY CITY, NEVT JERSEY, A

CORPORATION OF JERSEY.

STEEL RETAINER.

Application filed August 7, 1926. Serial No. 127,953.

This invention relates to rock drills, but more particularly to a steelretainer for fluid actuated rock drills of the hammer type.

The objects of the invention are to prevent ejection of the drill steelfrom the drill, to insure against accidental displacement of theretaining yoke, and to simplify the construction of retainers of thistype.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention consists of the combination of elements, arrangement ofparts, and features of construction substantially as hereinafterdescribed and more particularly pointed out in the appended claims andillustrated in the accompanying drawings, in which Figure 1 is asectional elevation of so much of a rock drill as will serve toillustrate the invention,

Figure 2 is a side elevation of the front end of a rockdrill showing theretainer in its retaining position,

Figure 3 is an end view of a rock drill showing the manner in which theyoke cooperates with the collar of the drill steel for preventingejection of the drill steel from the front head of the drill, and

Figure at is an end view of the retainer bearing.

Referring to the drawings, the invent-ion is shown applied to a rockdrill in which only a front head A, a front cylinder washer B and thefront end of a Cylinder C are shown.

A drill steel D having a collar E is sup- V orted by the front head Aand has a shank l which extends into the path of an anvil block G guidedby the front cylinder washer B for transmitting the blows of the hammerpiston H to the drill steel D. The parts comprising the casing of thedrill, namely the front head A, the front cylinder washer B, and thecylinder C are in this instance held in assembled relationship bysidebolts J which extend through suitable lugs K on the rearward end ofthe front head A.

In the present instance the side bolts J are of a length to extend wellforwardly of the lugs K for the reception of springs L which serve tocushion relative longitudinal movement of the front head A with respectto the cylinder C. t

In drills of the type to which the present invention relates, means areusually provided exterior of the drill for preventing ejection of thedrill steel from the drill. Such means are particularly desirable whenthe drill is being used for drilling thin layers of material such asconcrete pavements, or walls in which the drill steel readily penetratesthe material and upon the decrease of resistance against the drill bit,the hammer piston tends to force the drill steel out of the front head.In order to at all times insure the retention of the drill steel in thefront head, a yoke O is adapted to partly encircle the drill steel Dforwardly of the collar E and has rearwardly extending side arms P, thefree ends of which are provided with inwardly ex tending lateral hooks Qwhich cooperate rotatively with apertures R of bearings S. Thesebearings S are provided with longitudinal apertures T to cooperateslidably with the side bolts J whereon they are mounted, said side boltsJ being of sufficient length to enable the bearings S to be arrangedbetween the lugs K of the front head A and thesprings L whereby the saidbearings are constantly pressed against the lugs K. In this way thesprings Lalso serve as adequate cushioning means for the yoke O In orderthat the yoke 0 may at all times be held against accidental displacementfrom its retaining'position, the bearings S are provided withlongitudinal grooves U which cooperate with the side arms Pfor-preventing oscillation of the yoke O. The grooves U extend on bothsides of the apertures R thus rendering the bearings S reversible andinterchangeable on the side bolts J.

It is to be noted that the free ends of the side arms P are so spacedwith respect to each other that when the hooks Q, are inserted in theapertures, it will be necessary to spread the side arms P somewhat. Inthis way a certain springeifect will be obtained in the side arms andthe yoke which will be sufficient at all times to hold the side arms Pin engagement with the grooves U.

The foregoing described. retainer permits of several methods ofvassembling the same on the rock drill. A convenient method consists ininserting the hooks Q, in the apertures R of the bearings S and thenmounting the hearings on the side bolts J. The side bolts J, togetherwith the retainer and its bearings, may then be attached to the rockdrill in the usual manner. If, after the retainer has been. secured tothe rock hook in the opposite bearing.

' ever it isdesired to re noye,

from the front head, the yoke may be oscillated about the hooks Q untilthe side drill, breakage of the yoke should occur, another yoke may bereadily substituted therefor by merely inserting one of the hooks in oneof thebearings S and then spreading the arms]? for the insertionOflillfi other During theoperation of the drill, 'wlienarms Parevlrooked out of the grooves Sacha movement of the retainer Willremove the yoke from the path of the collar E of the drill steel D andthe drill steel D-maylthen be Withdrawn from the front head andanothersteel substituted therefor.

I claim: I

1. In a rock drill, the combination of a cylinder, a front head for thecylinder, a drill steel extending into the front head,- sidebolts forsecuring the front head to the cylinder, a yoke for preventing ejectionof the drill steel from the front head, side arms on the yoke, hooks onthe side armsand bearings slidable on the side rods to rotatablyreceive, the hooks for supporting the side arms in a plane offset fromthe longitudinal axis of the front head, sa d bearings being, reversibleWith; respect to the side bolts.

, 2. Inv a rock drill, the combination of a cylinder, afront head fortliecylinder, a drill steel extending into the front head, side boltsforsecnringthe front head to the cylinder,:a yoke for preventingejection of the drill steel from the front head, side armsioii the;yoke, inwardly extending lateral hooks 0n the side arms, and.bearingslslidable on for supporting the side arms in a plane,

offset from thelongitiidinal axisof the front head,said-bearingshavingegrooycs to cooperate ith the side arms fo yholdingthe yoke in retaining andreleasing, positions. 1

l In arock drill, tliecoinbiiiation ;of a

the drill steelcylinder, a front head for the cylinder, lateral lugs onthe front head, a drill steel eX- tending into the front heed, side rodsfor securing the front head to the cylinder, springs on the side rods, ayoke partlyencircling the drill steel for retaining said drill steel inthe front head, side arms on the yoke, nwardly extending latoi'alhookson the on the side arms, bearings slid-able side rods between thesprings and the lugs, said bearings having transverse apertures toreceive-the llOOlS for supporting the side arms in a plane offset fromthe longitudinal axis of the drill steel, and grooig'erin the sides ofthe bearings to cooperate with the side arms for holdingthe yoke inretaining and releasing positions.

, 5. Ina rock drill, the combination of a cylinder andfront head, adrill steel extending-into the front head, side bolts securing the fronthead to the cylinder,bearings on the side bolts, a yoke preventingejection of the drill steel from the front head, andside arms on theyoke pivoted With their free ends in the bearings, said side arms beingheld in engagement with the ibearingsiby the resiliencyof the side armsand the yoke. V l

6. In a'rock drill, the combination of a cylinder and fronthead,drill'steel extending into the front head, side boltssecuring the fronthead to the cylinder, bearings slidable, on the side bolts, saidbearings having, longitud nal grooves and transverse apertures, a yokefor retaining-the drill steel inthe front head, sideqaliml on the yoke,and-hooksuonthe, side arms extend erti res, said ing into the a sidearms being engaged by tie grooves and held in engagement therewith bythe resiliency or, the side armsand the yoke.

7. In a rockydrill, thecombiiiation of a cylinder and front head,sidebolts securing the ,front head to the cylinder, a drill, steelextending into the fronthead, means comprising a yoke with, sidearinsfor preventing ejection ofthe drill steel from the front head, bearngs on the. side bolts pivotally supporting the side arms, and means inthe bearings engaging, the side rods to hold the yokel n retainingposition, said side arms being heldin engagement with said means bytheresiliency of tlieiside arms and theyoke. In testimony whereof I havesigned this specification, i

CHARLES c. i-iiiiis ni.

